The annular-ring fix held: five of five boards work
Part three. Same design, one inverted flag put back, a different assembler. Five of five rev E boards flashed, drove the display and read the sensor.
· 8 min read
pcb
5 posts
The agent guessed a sensor's size. We built a mount around a part that doesn't exist.
You cannot prompt a model out of guessing. You can make the guess fail a gate: require a provenance field and reject any number without one.
· 4 min read
We told the fab the missing annular rings were intentional. They weren't.
Part two. The fab asked about one thing before building. We said it was deliberate. It was a parser bug, and it explains the open display headers.
· 8 min read
Custom PCB fabrication: three of five boards arrived dead
Three of five boards arrived dead and two had open joints. Test points found where power stopped, and later showed the open joints were our fault.
· 6 min read
From jumper wires to a custom PCB: building the HC-01 humidor controller
An ESP32 rat's nest became a four-revision custom board. The most expensive mistake was a sensor we never actually measured.
· 4 min read